The opening dialogue is used to show how he is at a party, losing it, and no one notices or cares. The two verses are used to show how he's barely able to think and talk straight on his descent. The part about "I don't want to destroy your tank-top" is showing how other people are on the brink of insanity already, but he's not "pushing them off" like they are to him; then, "To see you lying there in your Superman skivvies" shows how everyone is on the brink of insanity to begin with, even more so then he was in his "sweater." The music helps illustrate the ever-maddening mind of the guy, as it starts out normal, then at the end is hard, dark, and mad-sounding, showing his slow descent into madness.
Derek - Pittsburgh, PA, for above 2